commit d60b2b03da30093ae85458f1d0be3cc5c33d992c
author Kenneth Graunke <kenneth@whitecape.org> Wed Jul 21 20:24:29 2010 -0700
committer Kenneth Graunke <kenneth@whitecape.org> Wed Jul 28 15:46:28 2010 -0700
tree 904fe89d68c8cd1706c514b8b4bb06fcee5b842d
parent 53f306d573ce6393062cf86d4fe31148eacc5e1e

ir_constant_expression: Add support for the "reflect" builtin.

src/glsl/ir_constant_expression.cpp

diff --git a/src/glsl/ir_constant_expression.cpp b/src/glsl/ir_constant_expression.cpp
index 809ea60..c832081 100644
--- a/src/glsl/ir_constant_expression.cpp
+++ b/src/glsl/ir_constant_expression.cpp
@@ -1013,7 +1013,10 @@
       for (unsigned c = 0; c < op[0]->type->components(); c++)
 	 data.f[c] = M_PI/180.0 * op[0]->value.f[c];
    } else if (strcmp(callee, "reflect") == 0) {
-      return NULL; /* FINISHME: implement this */
+      assert(op[0]->type->is_float());
+      float dot_NI = dot(op[1], op[0]);
+      for (unsigned c = 0; c < op[0]->type->components(); c++)
+	 data.f[c] = op[0]->value.f[c] - 2 * dot_NI * op[1]->value.f[c];
    } else if (strcmp(callee, "refract") == 0) {
       return NULL; /* FINISHME: implement this */
    } else if (strcmp(callee, "sign") == 0) {